Dahua 5.8GHz Wireless AP/CPE User Manual
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3. Geographical environment
Place for the farthest distance of communication is sea level and clear flat land, which is the
generally-used geographical condition to evaluate the communication distance of wireless
communication devices. The second farthest are places like rural area, hill, riverbed and other half
obstacle, half open environment. The shortest communication distance is place like city building complex
or among mountains. In a word, the more intensive the obstacles are, the more influence it will cause to
wireless communication distance, especially to metal objects. Therefore, make sure the client and
access point are directly visible during the actual construction;
4. Electromagnetic environment
Direct current dynamo, grid system, switching power, electric welding machine, high frequency
electronics, computer, single chip and other devices all can cause different levels of influence to
communication distance of communication devices.
5. Climatic condition
The communication distance will be longer if the air is dry; the communication distance will be shorter if
the air is wet (especially rainy, snowy weather)
6. Try to avoid same frequency and adjacent frequency interference
Users need to search what frequencies that other devices are using first when setting the frequency of
access point, which has to avoid these frequencies as far as possible. Meanwhile, the access point
frequency has to be separated a certain distance from the surrounding frequencies which are being used
in order to prevent adjacent frequency interference. For example, when communication channel width is
20M, so it has to be separated over 20M from the frequency being used. Meanwhile, the frequency
between each AP should be set like this.
13.2 Test Situation
Testing distance: 3.5 km
Test environment: The test place is located between Beicai Town and Zhangjiang Town in Pudong New
